Check a label

Cellucor · Pre-workout

Is Cellucor C4 Sport underdosed?

1 scoop = 6.7 g30 scoopsLabel as of 23 Apr 2024 · NIH DSLD
Verdict

Below research dose on 1 of 3 key ingredients.

Caffeine is below the amounts studies use. 4 ingredients sit in an undisclosed blend. Caffeine is below 3 mg/kg at 75 kg.

Effective dose
0
Below research dose
1
Hidden in a blend
4
Too much
0

Ingredient by ingredient

Per scoop · bodyweight 75 kg (default)
  • Vitamin B6 (Pyridoxine Hydrochloride)Per scoop 3 mgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Vitamin B12 (Cyanocobalamin)Per scoop 60 mcgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • CalciumPer scoop 25 mgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Magnesium (Magnesium Chloride)Per scoop 12 mgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Sodium (Sodium Citrate)Per scoop 60 mgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Potassium (Dipotassium Phosphate)Per scoop 20 mgStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Beta-AlanineLabel: CarnoSyn (Beta-Alanine)Per scoop In a blendStudies 3.2–6.4 g/dayHidden in a blendStrong

    Amount not disclosed. As the 1st of 6 ingredients in the 3.18 g C4 Sport Performance Blend, it contains 0.53–3.18 g. Even that maximum is below the 3.2–6.4 g/day studies use.

  • L-ArgininePer scoop In a blendStudies 0.15 g/kgHidden in a blendWeak

    Amount not disclosed. As the 2nd of 6 ingredients in the 3.18 g C4 Sport Performance Blend, it contains ≤1.59 g. Even that maximum is below the 0.15 g/kg studies use.

  • Creatine MonohydrateLabel: Con-Cret (Creatine Hydrochloride)Per scoop In a blendStudies 3–5 g/dayHidden in a blendStrong

    Amount not disclosed. As the 3rd of 6 ingredients in the 3.18 g C4 Sport Performance Blend, it contains ≤1.06 g. Even that maximum is below the 3–5 g/day studies use.

  • Sodium CitratePer scoop In a blendStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Magnesium ChloridePer scoop In a blendStudies Not setNot gradedNot graded

    Not graded: a vitamin or mineral. We grade a pre-workout’s ingredients against exercise studies; vitamins and minerals are graded only on their own supplement pages.

  • Dipotassium PhosphatePer scoop In a blendStudies Not setNot gradedNot graded

    Not graded: we have no research dose for it from exercise studies.

  • TaurinePer scoop In a blendStudies 1–6 gHidden in a blendModerate

    Amount not disclosed. As the 1st of 4 ingredients in the 1.14 g C4 Sport Energy Blend, it contains 0.28–1.14 g. Studies use 1–6 g.

  • CaffeineLabel: Caffeine AnhydrousPer scoop 135 mgStudies 3–6 mg/kgBelow research doseStrong

    Contains 135 mg (1.8 mg/kg at 75 kg); studies use 3–6 mg/kg.

  • Pyridoxine HydrochloridePer scoop In a blendStudies Not setNot gradedNot graded

    Not graded: we have no research dose for it from exercise studies.

  • CyanocobalaminPer scoop In a blendStudies Not setNot gradedNot graded

    Not graded: we have no research dose for it from exercise studies.

Use “Check it for your dose” to see this table for your own scoops and bodyweight. Only caffeine is dosed per kilogram in the studies we cite; the other research doses are fixed amounts, so your weight doesn't change them.

C4 Sport Performance Blend
Proprietary blend · 6 ingredients · amounts not disclosed
3.18 g total

US labels must list blend ingredients heaviest first (21 CFR 101.36). So the 1st is at least 1/6 of the blend, the 2nd can be at most half, the 3rd at most a third, and so on.

  • Beta-Alanine · 1st0.53–3.18 g
  • L-Arginine · 2nd≤1.59 g
  • Creatine Monohydrate · 3rd≤1.06 g
C4 Sport Energy Blend
Proprietary blend · 4 ingredients · amounts not disclosed
1.14 g total

US labels must list blend ingredients heaviest first (21 CFR 101.36). So the 1st is at least 1/4 of the blend, the 2nd can be at most half, the 3rd at most a third, and so on.

  • Taurine · 1st0.28–1.14 g

How many scoops would it take?

To reach the low end of the research dose for each underdosed ingredient.

Caffeine to 225 mg
1.7 scoops
brings 225 mg caffeine

Where the reference doses come from

  1. Beta-Alanine, 3.2–6.4 g/day: Harris et al., 2006Hobson et al., 2012Trexler et al., 2015.
  2. Caffeine, 3–6 mg/kg: Guest et al., 2021.
  3. Creatine Monohydrate, 3–5 g/day: Kreider et al., 2017.
  4. L-Arginine, 0.15 g/kg: Viribay et al., 2020.
  5. Taurine, 1–6 g: Deng et al., 2025Waldron et al., 2018.
  6. Daily caffeine reference, 400 mg: US FDA, Spilling the Beans.
  7. Blend order rule: 21 CFR 101.36.
  8. Label data: National Institutes of Health, Office of Dietary Supplements. Dietary Supplement Label Database, 2026. https://dsld.od.nih.gov/. Label 309673.

Methodology 1.11. Read the full methodology or the corrections log.